DE8910748U1 - Device for wire shredding - Google Patents

Abstract

The invention relates to a device for wire comminution, with at least one revolving cutter 2 mounted on a rotating cutter support 1. In order to ensure a neat dividing cut of the continuous wire in a reliable mode of operation, provision is made for an opposing tool to be designed in the form of a cutting disc rotating about a vertical axis and provided with a central recess 5, and for the cutter support 1 to be mounted so as to rotate about a second axis 6 parallel to the first axis 4, and for the cutter 2 to be guided along the cutting disc 3. The device can be adapted to different conveying speeds of the wire and permits exact division of the wire into wire sections which are always identical. <IMAGE>

Description

'··' PATENT ATTORNEY

ARNEMISSLING Dipl.-Ing. &agr;(&Ogr;641) 71019. 63 Giessen

8 September 1989
Hi/Ko 89.249GN

Berkenhoff GabH
6301 Hypocrisy

Device for wire shredding

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The invention relates to a device for wire shredding with at least one rotating cutter mounted on a rotating cutter and a counter tool.

A device for shredding wire is known from EP-B1-0 210 482. The device is used in particular to cut the wire material emerging from a spark erosion machine to specific lengths in order to collect the wire, which is a waste product, and to be able to send it for further processing. The known device comprises a cutting tool provided with knives arranged on its circumference, which can be brought into engagement with a ring-shaped counter-tool. The wire is guided between the two tools and squeezed by the action of the cutting tools and the counter-tool. This leads to a deformation of the wire and to the tearing off of the respective wire end pieces. The disadvantage

The disadvantage of this device is that, on the one hand, the squeezing of the wire does not always ensure complete separation, so that the individual pieces of wire get stuck together, and, on the other hand, the separation points are irregularly formed and counteract the tightest possible packing in a receiving vessel.

In other known EDM machines, the wire is fed into a container without being cut and is compressed from time to time. This procedure requires, on the one hand, larger mechanical equipment to compress the wire and, on the other hand, is prone to failure, since the tightest possible volume packing of the wire cannot be achieved and thus wire areas can become entangled in loops.

DE-PS 36 31 888 shows a device for cutting wire, in which a first knife body is arranged in a fixed position, while a counter knife is moved back and forth past a through-opening of the knife body. In this device, the wire sections to be cut off are deformed by the action of the counter knife, so that they cannot be collected in a tightly packed container. Furthermore, due to the oscillating back and forth movement of the counter knife, two cutting directions are specified, which lead to different wire throws, so that the cut-off wire residues have to be collected in a very large collecting container. Furthermore, the step speed is limited due to the mass of the counter knife, so that this device can only be used with relatively slow-running EDM machines. A further disadvantage is that the

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Threading the wire can only be done by hand and is relatively difficult because the wire has to be redirected in the device. Another disadvantage is the relatively high wear on the cutting edges of the counter knife, which cannot be adjusted or regrinded.

The invention is based on the object of creating a device of the type mentioned at the beginning, which, with a simple structure and simple mode of operation, enables a reliable division of a wire, in which the wire sections can be collected in the tightest possible packing or layer and which can be adapted to the most varied wire conveying speeds.

According to the invention, the object is achieved in that the counter tool is designed in the form of a cutting disk that rotates about a vertical first axis and is provided with a central recess, and that the knife carrier rotates about a second axis parallel to the first axis.

?.O axis is mounted in a rotating manner and the cutter is guided along the cutting disc.

The device according to the invention is characterized by a number of significant advantages. Since the counter tool is designed in the form of a rotating cutting disk, it is always ensured that, due to the centrifugal force, the wire is placed against the outer edge of the central recess, so that a clean cut is made when the cutter is applied. A further advantage of the cutting disk is that it has a cutting edge on its entire circumference, i.e. the entire edge of the central recess, so that the overall

Wear and tear, due to the large length of the cutting edge, can be reduced, resulting in a longer service life of the cutting disc. Since the knife carrier also guides the blade along the cutting disc, a clean cut with a straight, precise cutting edge is possible, and squeezing or bending of the cutting area of the wire can be completely avoided.

The device according to the invention is therefore suitable for use in a wire erosion machine, since it is possible to divide the wire emerging from the machine and used for the cutting process into short wire sections and to store them temporarily in extremely tight packing, so that only a very small volume of storage container is required overall. A further advantage is that the exit direction of the wire ends is arranged vertically, so that they can be easily fed into a collecting container or a receiving device. The risk of individual wire sections leaving the device in an uncontrolled manner and being thrown outside the receiving device is thus completely eliminated.

In a favorable further development of the invention, it is provided that a deflection device for deflecting a wire from a horizontal to a vertical conveying direction is arranged in front of the cutting disk. This design is particularly advantageous when the wire running out of the erosion machine leaves the machine in a horizontal direction, as is usual with the known machines. Additional deflection devices or the like are therefore not required. This design therefore also simplifies the insertion of a wire, for example after a

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Wire breakage in the EDM machine, since the wire does not have to be additionally guided through special deflection mechanisms, etc.

Furthermore, it is advantageous according to the invention if the deflection device is designed in the form of a belt conveyor, since the belt conveyor is on the one hand simply constructed and easy to operate and on the other hand ensures safe guidance of the wire. Furthermore, the wire can be inserted in a particularly simple manner.

In order to ensure that the wire enters the deflection device safely, it is advantageous if a funnel guide is arranged in front of the deflection device in relation to the conveying direction of the wire. The funnel guide can preferably be provided with a wire sensor to ensure that the device for wire shredding is only put into operation when an erosion wire passes through it.

The device according to the invention is particularly suitable for simple control and adaptation to the respective wire feed speed of the erosion machine. According to the invention, it is possible to control a first drive device for the deflection device and a second drive device for the knife body and the cutting disk depending on the signals from the wire sensor or depending on a tensile force determined by the deflection device. The device according to the invention can therefore be adapted very variably to the respective operating conditions. With regard to tensile force control, it is possible to

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For example, it is possible to adjust the operating speed of the device by controlling the current of the drive motors.

The wire sensor, which is connected upstream of the deflection device, can be designed, for example, as a proximity sensor to detect the approach of a wire element, so that the device according to the invention can be switched off if a wire breaks or something similar. The device is also switched on automatically when a wire is to be inserted.

In order to ensure that the knife moves reliably, it is advantageous if the knife carrier is provided with at least one arm, at the end of which the knife is arranged. This prevents the cut pieces of wire from being thrown against central areas of the knife carrier and getting caught on them.

In a particularly advantageous embodiment of the invention, the knife carrier comprises four arms arranged in a cross shape, each with a knife, so that the overall rotational speed of the knife carrier can be reduced, since several arms can be brought into engagement with the cutting disk per revolution.

In order to simplify the transfer of the wire from the deflection device into the cutting disk, it can prove advantageous if a guide element that can rotate with the cutting disk is arranged between the deflection device and the cutting disk. This guide element can have a funnel-shaped recess.

Since the wire material discharged by the erosion machine is usually not stress-free, it is particularly advantageous if the device is designed to be electrically insulated from ground so that erosion processes on the cutting tools can be avoided. The wire guide parts of the device are advantageously electrically insulated.

Furthermore, it is advantageous to arrange a receiving device equipped with a vibrator downstream of the knife carrier in order to store the collected cut wire ends in the densest possible manner.

The invention is described below using an embodiment example in conjunction with the drawing. In this figure:

Fig. 1 is a side view of the device according to the invention ,

Fig. 2 is a detailed side view, partly in section, of the arrangement shown in Fig. 1,

Fig. 3 is a sectional view along the line III/III ZO of Fig. 2,

Fig. 4 a rear view of the device according to the invention and

Fig. 5 is a bottom view of the device with a view of the knife carrier and the cutting disc.

According to the invention, the device comprises a housing 16 or a carrier, on the underside of which a knife carrier 1 is rotatably mounted, to which several knives 2 are attached. In the embodiment shown

For example, the knife carrier 1 comprises a total of four knives 2, which are mounted at the ends of four cross-shaped arms 12.

The knife carrier 1 is rotatably mounted on the housing 16 about a second vertical axis 6. Also rotatably mounted on the underside or lower area of the housing 16 is a cutting disk 3 provided with a recess 5 , the cutting
disc 3 is rotatable or rotating about a first vertical axis 4. The two axes 4 and 6 are arranged parallel to one another and at a distance from one another , as can be seen in Fig. 5. When the knife carrier 1 rotates, the knife 2 thus sweeps over the underside of the cutting disc 3, so that a wire material passing through the central recess 5 is severed. Since the central recess 5 is freely accessible from the underside, the severed wire ends can easily fall out downwards to be caught in a receiving device 14 provided with a vibrator 15 (see Fig. 1).

The parallel arrangement of the two vertical axes 4, 6 can be seen in particular from Fig. 3, whereby the illustration according to Fig. 3 also shows that the cutting disk 3 and the knife carrier 1 are coupled to one another in terms of movement by means of a drive belt 17 or a suitable drive device. The knife carrier 1 is driven by a second drive device 11, which is connected to the knife carrier 1 via a shaft 18.

As can be seen from the figure in Fig. 3,

points the cutting disc 3 to its lower area

a spherical or convex fora, which facilitates the sliding of the knife 2.

The knives 2 can be arranged on the knife carrier i so that they are adjustable or can be adjusted in order to compensate for wear.

In the embodiment shown, the cutting disk 3 is integrally connected to a guide element 13 which is provided with a funnel-shaped recess which, as shown in Fig. 2, facilitates the introduction of the cutting material.

The device according to the invention further comprises a deflection device 7, which comprises a drive roller 19, which can be driven via a first drive device 10. From the illustration according to Fig. 3 it can be seen that the drive roller 19 is connected for this purpose to a shaft 22, which is in an operative connection with the drive device 10 in a suitable manner.

Furthermore, an air pressure roller 20 and a running roller 21 are provided. The running roller 21 and the drive roller 19 are wrapped by a belt 23, which is guided on the outer circumference of the pressure roller 20 and can be tensioned by means of a tension roller 24. In the area between the running roller 21 and the pressure roller 20, a funnel guide 8 is provided, through which the wire material can be inserted between the pressure roller 20 and the belt 23.

In the area of the funnel guide 8, a wire sensor 9 is also provided, which is held on the funnel guide 8 by means of a clamping rod 25.

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By means of the wire sensor 9 it is possible to determine whether a wire is passing through the funnel guide 8.

D'3 Deflection device 7 serves to deflect the horizontally conveyed wire mesh into a vertical direction.

In the embodiment according to the invention, it is possible to set the blade speed so that wire pieces with a constant wire length are always cut. The adjustment can be coupled to the tensile force ω,Λ determined by the deflection device, so that a corresponding assignment is always present. The device is switched on and off either using the wire sensor 9 or using the tensile stress of the erosion wire determined by the deflection device 7. The device according to the invention thus switches off automatically when the erosion machine is at a standstill and is automatically put into operation when it is switched on. The wire sensor 9 is used in particular to detect a wire break, since the sensor is designed as a proximity sensor which detects when the wire is in contact with the wall of the funnel of the funnel guide 8.

The device according to the invention is designed in such a way that no wire residue can remain in the device, especially not in the event of a wire break. A further advantage of the device is that the wire lengths can be set and maintained constant regardless of the throughput speed of the EDM machine, since the rotational speed

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speed of the cutter carrier 1 and the cutting disk 3 are independent of the conveying speed of the deflection device 7.

The central recess 5 and the cutting edge created on it ensure that the wire pieces are always cut at right angles in a clean cutting line. Crushing etc. is avoided.

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The deflection device according to the invention enables

Furthermore, the device in the event of a standstill of the

To stop the erosion machine without affecting the tension of the wire would be affected. Furthermore, it is

possible to insert the wire in a particularly simple way into the

device. so that especially when new

loading the erosion machine cumbersome manual

Settings may be omitted.

The simple construction of the device according to the invention enables it to be used with a wide variety of wire erosion machine designs. so that it is universally applicable.

Claims (13)

Device for wire shredding Sch u t &zgr;a&eegr; s &rgr; r U c &eegr; e 1. Device for wire shredding with at least one rotating cutter (2) mounted on a rotating cutter carrier (1) and a counter tool, characterized in that the counter tool is arranged in the form of a ty i no uoi*t itf 3 rst axis <4> rotating, sit a a cutting disk (3) provided with a central recess (5) and that the knife carrier <1) is mounted so as to rotate about a second axis (6) parallel to the first axis (4) and the knife (2) is guided along the cutting disk (3). 2. Device according to claim 1, characterized in that a deflection device (?) for deflecting a wire from a horizontal to the vertical conveying direction is arranged upstream of the cutting disk (3). 3. Device according to claim 2, characterized in that the deflection device (?) is designed in the form of a belt conveyor. 4. Device according to claim 2 or 3, characterized in that, with respect to the conveying direction of the wire, a funnel guide (8) is arranged in front of the deflection device (7). 5. Device according to claim 4, characterized in that the funnel guide (8) is provided with a wire sensor (9) 0. 6. Device according to claim 5, characterized in that a first drive device (10) for the deflection device (?) and a second drive device (11) for the knife carrier (1) and the cutting disk (3) can be controlled depending on the signals from the wire sensor (9). 7. Device according to one of claims J to 6, characterized in that a first drive device (10) for the deflection device (7) and a second drive device (II) for the knife body (1) and the cutting disk (3) are controllable as a function of the tensile force determined by the deflection device (7) . 8. Device according to one of claims 5 to 7, characterized in that the wire sensor (9) is designed as a proximity sensor. 9. Device according to one of claims 1 to 8, characterized in that the knife carrier (1) is provided with at least one arm (12), at the end region of which the knife (Z) is arranged. 10. Device according to one of claims 1 to 9, characterized in that the knife carrier (1) comprises four arms (12) arranged in a cross shape, each with one knife (2). 11. Device according to one of claims 1 to 10, characterized in that? characterized in that a guide element (13) which is rotatable with the cutting disk (3) is arranged between the deflection device (7) and the cutting disk (3). 12. Device according to one of claims 1 to 11, characterized in that the device is designed to be electrically insulated from ground. 13. Device according to one of claims 1 to 12, characterized in that a receiving device (14) provided with a vibrator (15) is arranged downstream of the knife carrier (1).